orangefs: Do not truncate file size

'len' is used to store the result of i_size_read(), so making 'len'
a size_t results in truncation to 4GiB on 32-bit systems.

Signed-off-by: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Link: https://lore.kernel.org/r/20250305204734.1475264-2-willy@infradead.org
Tested-by: Mike Marshall <hubcap@omnibond.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>

Author: Matthew Wilcox (Oracle)

fs/orangefs/inode.c

@@ -23,9 +23,9 @@ static int orangefs_writepage_locked(struct page *page,
 	struct orangefs_write_range *wr = NULL;
 	struct iov_iter iter;
 	struct bio_vec bv;
-	size_t len, wlen;
+	size_t wlen;
 	ssize_t ret;
-	loff_t off;
+	loff_t len, off;
 
 	set_page_writeback(page);
 
@@ -91,8 +91,7 @@ static int orangefs_writepages_work(struct orangefs_writepages *ow,
 	struct orangefs_write_range *wrp, wr;
 	struct iov_iter iter;
 	ssize_t ret;
-	size_t len;
-	loff_t off;
+	loff_t len, off;
 	int i;
 
 	len = i_size_read(inode);